Can you please tell me where the underground scenes were filmed for the Doctor Who episode Flatline (18 October BBC1)? It looked like an old Tube tunnel.

Ricky Allder, Bexhill-on-Sea, East Sussex

Flatline director Douglas Mackinnon explains: "The tunnels were partly built in the studio, partly computer-generated and partly filmed on the Winchcombe Railway line in the Cotswolds." The magic of television!

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